From d542f117c903dd0306bdace4e75d2adaa4de8610 Mon Sep 17 00:00:00 2001
From: Huaishun Hu <huhuaishun@icloud.com>
Date: Mon, 4 Dec 2017 20:09:55 +0800
Subject: [PATCH] add Vimdiff function

---
 functions/Vimdiff.vim | 28 ++++++++++++++++++++++++++++
 vimrcs/basic.vim      |  2 +-
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 functions/Vimdiff.vim

diff --git a/functions/Vimdiff.vim b/functions/Vimdiff.vim
new file mode 100644
index 00000000..83970ec4
--- /dev/null
+++ b/functions/Vimdiff.vim
@@ -0,0 +1,28 @@
+" see: https://brookhong.github.io/2016/09/03/view-diff-file-side-by-side-in-vim.html
+
+function! Vimdiff()
+    let lines = getline(0, '$')
+    let la = []
+    let lb = []
+    for line in lines
+        if line[0] == '-'
+            call add(la, line[1:])
+        elseif line[0] == '+'
+            call add(lb, line[1:])
+        else
+            call add(la, line)
+            call add(lb, line)
+        endif
+    endfor
+    tabnew
+    set bt=nofile
+    vertical new
+    set bt=nofile
+    call append(0, la)
+    diffthis
+    exe "normal \<C-W>l"
+    call append(0, lb)
+    diffthis
+endfunction
+autocmd FileType diff       nnoremap <silent> <leader>vd :call Vimdiff()<CR>
+
diff --git a/vimrcs/basic.vim b/vimrcs/basic.vim
index 6c3d6dd3..d371d96a 100644
--- a/vimrcs/basic.vim
+++ b/vimrcs/basic.vim
@@ -63,7 +63,7 @@ nmap <leader>w :w!<cr>
 
 " :W sudo saves the file 
 " (useful for handling the permission-denied error)
-command W w !sudo tee % > /dev/null
+command! W w !sudo tee % > /dev/null
 
 
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""